1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the plplaaoo GRW8-01 Temperature Control Relay. This device is designed to monitor and control temperatures in various applications, offering both heating and cooling modes. Please read this manual thoroughly before use to ensure safe and efficient operation.
2. Safety Information
Always observe the following safety precautions:
- Ensure power is disconnected before installation or maintenance.
- Installation should be performed by qualified personnel only.
- Verify correct wiring connections to prevent damage or malfunction.
- Do not exceed the specified voltage and current ratings.
- Protect the device from moisture and extreme temperatures outside its operating range.
3. Product Overview
The plplaaoo GRW8-01 is a digital temperature control relay designed for single-phase monitoring. It features selectable heating/cooling modes and LED indicators for operational status.
Key Features:
- Monitors high/low temperatures.
- Selectable heating or cooling mode.
- LED indicators for power (green) and output relay (red).
- Wide power supply compatibility: AC/DC 24V-240V, 50/60Hz.
- Adjustable temperature range: -15℃ to +45℃.
- Adjustable hysteresis value: 0.5℃ to 5℃.
- DIN rail installation (35mm).
Package Contents:
- 1 x GRW8-01 Temperature Control Relay
- 1 x Temperature Probe
- 1 x User Manual (this document)
4. Setup and Installation
The GRW8-01 relay is designed for 35mm DIN rail installation. Follow these steps for proper setup:
4.1 Mounting
Mount the relay onto a standard 35mm DIN rail in a suitable enclosure. Ensure adequate ventilation and protection from environmental factors.
Figure 4.1: Side view of the GRW8-01 relay, illustrating the DIN rail mounting mechanism. The red clips at the bottom are used to secure the device to a 35mm DIN rail.
4.2 Wiring Connections
Refer to the wiring diagram and terminal labels for correct connections. Ensure all connections are secure and comply with local electrical codes.
- Power Supply (L-N): Connect AC/DC 24V-240V to terminals A1 and A2.
- Temperature Probe (NTC): Connect the provided temperature probe to terminals T1 and T2.
- Output Relay (SPST): Connect the controlled device to terminals 11 and 14. This is a single-pole, single-throw contact.
Figure 4.2: Detailed wiring diagram for the GRW8-01 relay. It shows connections for the power supply (A1, A2), the NTC temperature probe (T1, T2), and the output relay contacts (11, 14).
Figure 4.3: The GRW8-01 temperature control relay shown installed within an electrical panel, demonstrating typical wiring connections to terminals A1, A2, T1, T2, 11, and 14. The front panel controls for temperature and hysteresis are visible.
Figure 4.4: The NTC temperature probe included with the GRW8-01 relay. This probe is essential for accurate temperature measurement and control.
5. Operating Instructions
Once installed and wired, configure the GRW8-01 relay using the front panel controls.
5.1 Power On
Apply power to the A1-A2 terminals. The green "Un" LED indicator will illuminate, indicating the device is powered.
5.2 Mode Selection (Heating/Cooling)
Use the "FUNC" switch to select the desired operating mode:
- HEAT: For heating applications. The output relay will activate when the temperature falls below the set point minus hysteresis.
- COOL: For cooling applications. The output relay will activate when the temperature rises above the set point plus hysteresis.
5.3 Temperature Setting
Adjust the "Temperature" dial to set the desired temperature set point. The range is -15℃ to +45℃.
5.4 Hysteresis Setting
Adjust the "Hysteresis" dial to set the temperature difference before the relay changes state. The range is 0.5℃ to 5℃. Hysteresis prevents rapid cycling of the controlled device.
Figure 5.1: Close-up of the GRW8-01 relay's front panel, showing the "Un" (power) and "R" (relay output) LED indicators, the "FUNC" switch for heating/cooling mode, and the dials for "Temperature" and "Hysteresis" settings.
5.5 Output Relay Indication
The red "R" LED indicator illuminates when the output relay is active (contacts 11-14 are closed).
6. Maintenance
The GRW8-01 relay requires minimal maintenance. Follow these guidelines:
- Cleaning: Keep the device clean and free from dust. Use a dry, soft cloth for cleaning. Do not use liquid cleaners.
- Inspection: Periodically inspect wiring connections for tightness and signs of wear or damage.
- Environment: Ensure the operating environment remains within the specified temperature and humidity ranges.
7. Troubleshooting
If the GRW8-01 relay is not functioning as expected, refer to the following table:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power (Green "Un" LED off) | No power supply to A1-A2 terminals; incorrect voltage. | Check power supply connections and voltage (AC/DC 24V-240V). |
| Output relay not activating (Red "R" LED off) | Temperature not within set range; incorrect mode (HEAT/COOL); faulty probe. | Verify temperature set point and hysteresis; check FUNC switch; inspect temperature probe connection (T1-T2). |
| Inaccurate temperature readings | Faulty temperature probe; probe not correctly positioned. | Check probe connection; ensure probe is in the correct sensing location; replace probe if damaged. |
| Relay cycles too frequently | Hysteresis value set too low. | Increase the hysteresis value using the "Hysteresis" dial. |
If problems persist, contact customer support.
8. Specifications
| Parameter | Value |
|---|---|
| Function | Monitor high/low temperature |
| Power Terminal | L-N |
| Rated Power Supply Voltage | AC/DC 24V-240V |
| Rated Power Frequency | 50/60Hz |
| Rated Impulse Withstand Voltage | 2.5kV |
| Rated Insulation Voltage | 250V |
| Maximum Power Consumption | 2VA |
| Power Supply Allowable Fluctuation Range | -15%~+10% |
| Temperature Adjustment Range | -15℃ to +45℃ |
| Temperature Adjustment Hysteresis Value | 0.5℃ to 5℃ |
| Working Mode | Heating-cooling-on and off can be set |
| Power Indicator | Green LED |
| Output Parameters | 1xSPST 16A/AC1 250VAC/24VDC |
| Minimum Switching Power | 500mW |
| Output Relay Indication | Red LED |
| Mechanical Life | 1x107 |
| Electrical Life (resistive Load) | 1x105 |
| Working Environment Temperature | -20℃ ~+55℃ |
| Storage and Transportation Environment Temperature | -35℃~+75℃ |
| Installation Method | Approx. 35mm / 1.4in rail installation |
| Protection Level | IP20 |
| Installation Location | Any |
| Pollution Degree | 2 |
| Wiring Capacity | 1x2.5mm² or 2x1.5mm² 0.8Nm |
| Item Weight | 3.53 ounces |
| Package Dimensions | 7.48 x 6.3 x 0.79 inches |
9. Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact plplaaoo customer service through the retailer where the product was purchased. Please have your model number (GRW8-01) and purchase date available when contacting support.
Online resources may be available at the plplaaoo Store on Amazon.